Research Of Multi-constrained QoS Routing Based On Service Identification

With the popularity and development of Internet, it carries more and more business, in addition to traditional services, the multimedia applications are emerging in endlessly, which require communication network providing efficient quality of service. For these applications that have special requirements such as the bandwidth,packet loss rate,delay,delay jitter Etc., the existing best-effort transmission mode already cannot satisfy their requirements. Therefore, in order to improve network resource utilization efficiency, to provid users with high-quality services as a target of the QoS research is an important research field of Internet.This paper first introduces the QoS-related technologies and research status, describing two architectures: Integrated Services Architectures and Differentiated Serviees Architectures, and gives the concept of QoS routing, introducing the three basic routing algorithms and several main unicast QoS routing algorithms. Aiming at the complexity of the services on the Internet, in order to provide high quality network services, this paper uses flow-based traffic flow identification technology, to distinguish between various bussiness, what's more, presents QoS routing model based on traffic classification, analyzing the working principle of the model, and introduces several main business types and the corresponding parameter constraints. On this basis, this paper also studies the QoS routing problems that contain no more than one parameter and multiple constraints, and proposes a new multi-constrained QoS routing algorithm——HRAMC algorithm,the thinking and operational processes are described in detail , and the time complexity of the algorithm is analyzed. Finally, through analyzing the algorithm simulation experiment by NS2 simulation tool, the simulation results show that the algorithm has good performance.